Will this model work on my 5 speed mountain bike? Thanks

Actually, it should work fine. As someone else stated, the spacing is different between 7 and 5 speed indexing, BUT it is the shifter that does the indexing, NOT the derailluer. So as long as you have the correct shifter on your handle bars or downtube, this should work. The reason the spacing is different is because manufacturers used different chain thicknesses and closer spacing to match as they added more gears within the same basis space. The rear cassette is about the same width between a 5 speed and a 10 speed, the individual cogs are just closer together the more speeds you have. The indexing is handled by the shifter... so if you wish to convert from 5 speed to more in the rear, the parts that change are the shifter at the front and the chain when you go from 5 to 6/7/8, then again to 9 and again to 10. I recently converted a recumbent trike from 7 to 10 speeds in the rear using a Sunrace freewheel and KMC 10-speed chains with MicroShift bar-end 10 speed shifters using a Shimano 9 speed rear derailleur. Shifts great. Only reason I changed the rear derailleur out was due to slop in the 7 speed one that made it not shift or skip shift in certain gears. I used this on my son's hybrid mountain bike for the same reason and it shifts great.

is this a sis derailer?

This is a shimano altus rear derailed

Is the cable adjuster a fastener (using wrench) or a hex screw (using allen key)?

It's a hex screw. We will update the image

Anyone know if this will work with friction shifter?

Yes, friction shifters are a basic shifter equipped on many bikes as long as they are in working order, cables not seized and move freely inside cable housing. This works on old and new bikes regardless of its year as long as the bike has 7 or 8 speed cassettes that would be multiple cogs or sprockets , they have been called attached to the rear wheel.

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SHIMANO Altus Mountain Bike Rear Derailleur - Direct Mount - RDM310

SHIMANO Altus Mountain Bike Rear Derailleur - Direct Mount - RDM310

4.7/5

Product ID: 2629271

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Details

Brand
SHIMANO
Color
Silver
Material
Metal
Item Weight
0.01 Ounces
Case Material
Aluminum

🔩Direct Braze-On mount for sleek fit

⚙️7/8-speed precision shifting

🚴‍♂️34T max tooth capacity for versatile gearing

Description

⚙️ Shift into the future of urban adventure with Shimano Altus!

DIRECT BRAZE ON MOUNT - Sleek, secure installation that keeps your bike frame clean and performance sharp.
TRUSTED SHIMANO QUALITY - Backed by a limited warranty and Shimano’s legacy of durable, high-performance cycling components.
ROBUST 34 TOOTH CAPACITY - Handle diverse terrains with a wide gear range designed for both urban and trail rides.
SEAMLESS 7 8 SPEED SHIFTING - Experience smooth, reliable gear changes tailored for city sport and youth MTB bikes.
COMPACT LIGHTWEIGHT DESIGN - Optimized dimensions (4.25"L x 3.75"W x 6.5"H) and just 0.41 kg for agile handling.

The SHIMANO Altus RDM310 is a 7/8-speed rear derailleur featuring a direct braze-on mount and a 34-tooth max capacity, designed for smooth, reliable shifting on city sport and youth mountain bikes. Compact and lightweight, it delivers Shimano’s trusted performance and durability for versatile cycling needs.

Specifications

Mounting Type	Braze-On Mount
Number of Teeth	34
Product Dimensions	4.25"L x 3.75"W x 6.5"H
Manufacturer	Shimano
UPC	689228130913
Global Trade Identification Number	00689228130913
Item Package Dimensions L x W x H	7.28 x 4.13 x 3.82 inches
Package Weight	0.41 Kilograms
Item Dimensions LxWxH	3.75 x 4.25 x 6.5 inches
Brand Name	SHIMANO
Warranty Description	Limited Warranty
Model Name	ERDM310DS
Number of Items	1
Part Number	ERDM310DS
Included Components	Rear Derailleur
Size	7/8spd
Sport Type	Cycling

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SHIMANO Altus Mountain Bike Rear Derailleur - Direct Mount - RDM310

Details

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